def func(self, max_tracks, tracks, ret_tracks):
	results = set()

	if len(tracks) > 0:
		random_files = list(tracks)

		random.shuffle(random_files)

		if max_tracks > len(random_files):
			max_num = len(random_files)

		results = set(self.load_tracks(random_files, max_tracks))

	ret_tracks |= results
